Method of separating a solid-liquid mixture by wringing a twisted filter belt enclosing the mixture

A method for solid-liquid separation comprising the steps of:

• causing a looped filter cloth member to travel, said filter cloth member being wound at least once around a wringing roller, and having a twisted portion at which said filter cloth member is twisted at least once and wound around said wringing roller;
• inducing a primary rotary motion of said wringing roller in a direction in which said filter cloth member travels;
• inducing secondary rotary motion of said wringing roller in a direction in which said filter cloth member is twisted upstream with respect to said wringing roller;
• and
• supplying a solid-liquid substance to an upstream portion of said filter cloth member with respect to said wringing roller, with liquid in said solid-liquid substance penetrating the filter cloth member as said filter cloth member travels past said wringing roller.